fix: implemented client side rate limiting

[NotIshi28]

So I had seen quite a few people who added their project twice by clicking on submit twice, so implemented client side rate-limiting.

I have not tested this yet as I don't have the env, so just test it once

[vercel]

@NotIshi28 is attempting to deploy a commit to the Hack Club Team on Vercel.

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[Gitstar-OC]

Looks good, although you could have done it using a single useState hook rather than 2 (as both the hooks are being used for ratelimiting)